All, noting I designed the SUPLEX 5L with support from SUPLEX and other suppliers, so I am an interested party.
I note http://www.talkmorgan.com/ubbthreads.php/galleries/315909/Tweaking_Henry's_rear_end_(5_l
I won't add much (for a change!):-
The rear adjustable Quantum dampers: I set the damper curves and the range from as soft as even I would dare and hard enough for trackdays. I am glad Adrian found a softer damper setting to suit him, as the car had only really been driven two up since fitting and we initially set the dampers on the demo car mid way. The 5L coilover units have significant spring rate progression (goes from soft to firm in bump and with luggage) and good bump stop progression, so typically damping should be set to only get occasional full bump impacts.
Front dampers on the Williams 5L demo car are SUPLEX RS Bilsteins, that some do find a bit too soft. I am now working with Quantum to specify adjustable front dampers to match the rear Quantums. Also working with Bilstein to specify some nonadjustable monotubes for the rear to match the RS up front.
Generally. We had set the front RS Bilsteins on the soft side for good ride with no intended deterioration in handling (a bit subjective that I know), but then also relying on the spring rate stiffness progression from the little RS Rate Riser spring on the king pin to give the extra weight transfer to the outer front wheel to add to the turn-in response. Inevitably this will be a slightly delayed response compared with the traditional hard bump damping and high initial spring rate with a compressed rebound spring.
We have built in significant roll stiffness progression in the 5L, so yes indeed much less roll than a std car. Thus we get good single wheel compliance for ride then in roll the system stiffens up with the complex link arrangement we have incorporated. (Better than an antiroll bar that would be linear.)
One other great benefit the 5L gives is absolutely no axle tramp but without the unwanted spring rate increase that the Morgan anti-tramp bars on leaf springs inevitably give. The ability to now get grip out of fast bumpy corners on hard acceleration can really be appreciated with all the grunt the 3.7 so fitted can give.
Does this take away the character of a Morgan, not from the reactions we have had to so. That's all for now - PJB.
